假定其他条件不变，如果某种商品(非吉芬商品)的价格下降，根据效用最大化原则，消费者对这种商品的购买量会( )。
A．不改变
B．减少
C．增加
D．增加或减少
参考答案：C
解析：[分析]
本题是一道综合题。消费者达到最大效用的均衡条件是，两种商品的边际替代率或边际效用之比等于两种商品的价格之比。显然，一种商品的价格下降，要使消费组合继续满足效用最大化的均衡条件，必须使该种商品的边际效用相应减小。如何使该种商品的边际效用相应减小呢根据边际效用递减规律，随着一种商品消费量的增加，其边际效用即每增加的一单位商品消费所带来的效用是递减的，从而可以通过增加该种商品的消费量来达到使该种商品的边际效用减小的目的。因此，本题的正确选项为C。
It was the beginning of  the school year a few years ago and I had a little boy in my class who came from a non-English speaking home. He was very quiet and shy. I wasn’t sure how much he understood during the school day and I was especially concerned that he just stood by himself at break time and did not play. If I tried to talk to him, he would turn away and tightly shut his eyes to hide from me.After a day or two of this, I decided to seek the help of one of my outgoing and friendly little girls. I called her over and she ran to me, ready to help. I immediately began a long speech about what I needed from her. I asked her if she would try to get him to play, and I started talking quickly about all these suggestions on how she could start communicating with him. I explained she could do this, she could do that, she could try this idea, she could try that idea. She touched my arm to stop my talking and looked up at me in that wise and special way that only a six-year-old can, and said, “Don’t worry. I speak kid.” And she ran off. I stood there all alone, silently watching her. It took less than a minute for the two new friends to run off, hand in hand, happily joining a game of tag(捉人游戏) taking place all over the gym.I often think of that small moment, about what I learned and how important it is for all teachers to speak kid—big kid, little kid and middle kid. I knew my focus must be on teaching students how to think, how to approach problems, and how to figure out solutions and never take the opportunity away. We must be ready to learn from our students because those “teachable moments” during the school days are for us, the teachers, as well as our kids. 小题1:. Why did the author worry about the boy?
After the girl agreed to help, the author .
By saying “I speak kid”, the girl meant that she could .
The underlined words “the opportunity” refer to the chance to .
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